//
//  Person.h
//  12.KVO的本质
//
//  Created by 梁森 on 2020/2/11.
//  Copyright © 2020 梁森. All rights reserved.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface Person : NSObject

@property (nonatomic, assign) int  age;


@end

NS_ASSUME_NONNULL_END
